One thing to remember about Jordan vs Kobe as a comparison, Jordan didn't get the same post game treatment as Kobe will have been getting throughout his career. When Jordan started out I'm sure post game recovery was a few years away. So that will help Kobe. Keep in mind, you look at a guy like Shaq who by old school standards should have been done a few years ago, and he is still going pretty strong for how old he is. Another player I wonder about is Allan Iverson.
kobe is so driven to prove he's one of the best ever that it wouldn't surprise me to see him stick around as long as he physically can play, just to move up the all time scorers list. with modern treatments and an amazing work ethic, there is no telling how long he can play. maybe another 8-10 years.